Going-to-the-Sun Road in Montana's Glacier National Park has become a major tourist attraction. Find out more about this man-made engineering feat which has been seamlessly woven into the park's natural beauty.

Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.

Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.

Going-to-the-Sun Road in Montana's Glacier National Park has become a major tourist attraction. Find out more about this man-made engineering feat which has been seamlessly woven into the park's natural beauty.